Completely mixed

• Simple design and operation

• Moderate capital and operating costs

activated sludge

• More resistant to toxic shock loads than others

• Susceptible to the growth of


• Useful in a wide range of applications

filamentous organisms

Extended aeration

• Simple design and operation

• Large bioreactor volumes required

activated sludge

• Reduced sludge production

• Poor sludge settleability


• Organically stable waste sludge

• Higher oxygen requirement

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